package io.renren.utils;

import com.alibaba.fastjson.JSON;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DuplicateKeyException;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 异常处理器
 *
 * @author chenshun
 * @email sunlightcs@gmail.com
 * @date 2016年10月27日 下午10:16:19
 */
@Component
public class RRExceptionHandler implements HandlerExceptionResolver {
  private Logger logger = LoggerFactory.getLogger(getClass());

  @Override
  public ModelAndView resolveException(HttpServletRequest request,
                                       HttpServletResponse response, Object handler, Exception ex) {
    R r = new R();
    try {
      response.setContentType("application/json;charset=utf-8");
      response.setCharacterEncoding("utf-8");

      if (ex instanceof RRException) {
        r.put("code", ( (RRException) ex ).getCode());
        r.put("msg", ( (RRException) ex ).getMessage());
      } else if (ex instanceof DuplicateKeyException) {
        r = R.error("数据库中已存在该记录");
      } else {
        r = R.error();
      }

      //记录异常日志
      logger.error(ex.getMessage(), ex);

      String json = JSON.toJSONString(r);
      response.getWriter().print(json);
    } catch (Exception e) {
      logger.error("RRExceptionHandler 异常处理失败", e);
    }
    return new ModelAndView();
  }
}
